Awkward silence between best male friend and I?

I'm a girl. For the past few months, he moved away and we had to communicate via IM. It was on a daily basis and we talked about anything. It became apparent recently that we are now more than friends...and it became slightly awkward. He started delaying his replies, or would say "hi" and then go offline. But when he does talk, he would talk nicely...so I don't think he's upset about anything, and claimed he isn't.

But if he isn't upset, why would he avoid conversations. What should I do?
Awkward silence between best male friend and I?
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